Concrete slab



FIG. 1 is a perspective view of a concrete slab that embodies my design;

FIG. 2 is a top view of the concrete slab of FIG. 1;

FIG. 3 is a front view of the concrete slab of FIG. 1;

FIG. 4 is a side view of the concrete slab of FIG. 1;

FIG. 5 is an enlarged cross-sectional view taken along 5-5 of FIG. 2;

FIG. 6 is a top view of an alternate embodiment of a concrete slab that embodies my design; and,

FIG. 7 is an enlarged cross-sectional view taken along 7-7 of FIG. 6.

The broken lines in the drawings depict portions of the concrete slab that form no part of the claimed design. 

CLAIM The ornamental design of a concrete slab, as shown and described. 